研究生: |
張詩意 Shih-yi Chang |
---|---|
論文名稱: |
高功率白光LED之混光實驗、模組設計及模擬優化 Color-Mixing, Modules Design and Simulation Optimization of High-Power White-Light LEDs |
指導教授: |
廖顯奎
Shien-Kuei Liaw |
口試委員: |
曾孝明
Shiao-Min Tseng 孝三良 San-Liang Lee 黃忠偉 Jong-Woei Whang 董正成 Jeng-Cherng Dung |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電子工程系 Department of Electronic and Computer Engineering |
論文出版年: | 2006 |
畢業學年度: | 94 |
語文別: | 中文 |
論文頁數: | 88 |
中文關鍵詞: | 混光 、黃光螢光粉 、光學設計模擬 、聚光 、高功率發光二極體 、白光發光二極體 |
外文關鍵詞: | color mixing, yellow phosphors, optical design and simulation, light focus, high power light emitting diodes, white light light emitting diodes |
相關次數: | 點閱:359 下載:11 |
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白光發光二極體將是未來引導綠色(環保)照明時代的主流,本論文主要研究高功率、大面積白光之發光二極體混光實作及其光學設計。在白光發光二極體混光實驗方面,3 W的藍光發光二極體晶片混不同黃光螢光粉中,分別加入釔鋁石榴石、鋱鋁石榴石及矽酸鹽三種螢光粉,從實驗的量測及頻譜得知,加入釔鋁石榴石可獲得發光效率29.03 lm/W,在條件相同情況下,發光二極體加入釔鋁石榴石有較好的發光效率,鋱鋁石榴石則可獲得較佳的演色指數,其值為83甚至更高,矽酸鹽的發光效率與鋱鋁石榴石差不多,但演色性較差只有70左右,在色溫方面,釔鋁石榴石及矽酸鹽適合配出色溫6000 K的冷白光,若要得到色溫3000 K的暖白光,則要使用鋱鋁石榴石方可有理想的光色,所以針對白光發光二極體之特性需求,選擇適當的螢光粉來做混光達到最佳的效果是很重要的。
在發光二極體光學設計模擬部份,使用TracePro光學模擬軟體,首先使用混光實驗的3 W白光建立光源,再加上聚光管來達到聚光的效果,即使模組大小控制在高40 mm、半徑15 mm之尺寸規格內,仍可使出光半角由光源的90度縮小到60度。再來是將聚光管與透鏡做適當的接合,模擬得到最高之光強度較尚未加透鏡時高了2.5倍以上,出光半角也由原來的90度縮小到25度以下,確實達到所要求出光半角小且聚光的效果。
It was well known that white light light emitting diodes (LEDs) will lead the way to green (i.e., environmental protection) illuminant age in the near future. The thesis experiments demonstrates color-mixing and theoretical design of large-area, high-power white-light LEDs. Regarding the color-mixing experiments, a 3W blue LED is obtainable by mixing different yellow phosphors with a white light LED. The candidate phosphor could be yttrium aluminum garnet (YAG), terbium aluminum garnet (TAG), or Silicate. According to the experimental data and measured spectra, we find that YAG in LED has better photometric efficiency of 29.03 lm/W under the same condition while TAG in LED has a better color rendering index of 83 or even large. Although the photometric efficiency of Silicate is as good as that of TAG, its color rendering index is only 70 as TAG. Regarding the color temperature issue, YAG integrated Silicate is suitable to obtain the cool white light of 6000 K, while TAG integrated Silicate can produce the warm white light of 3000 K. So, it is important to select appropriate phosphors for color-mixing of white light LEDs to reach the best effect.
The optic software TracePro is used to optimize design the LEDs. The light source is established by using a 3W white light LEDs. A spot tube is added into it to improve its light-focus performance. Even the size of LED module is controlled under 40 mm in height and 15 mm in radius, the directional half angle of LEDs could decrease from 90 degrees to 60 degrees. When a focus len is designed and combined with the spot tube, the directional half angle is further reduced to 25 degree and the maximal emitting power is 2.5 times improvement.
[1] R. H. Horng, D. S. Wuu, and S. C. Wei, “AlGaInP/AuBe/glass light-emitting diodes fabricated by wafer bonding technology,” Appl. Phys. Lett., vol. 75, 154, 1999.
[2] 董德國和陳萬清譯, “光纖通訊,” 東華書局, Feb. 2001.
[3] N. Narendran, L. Deng, R. M. Pysar, Y. Gu, and H. Yu, “Performance characteristics of high-power light-emitting diodes,” in Proc. SPIE Third Int. Conf. on Solid State Lighting, vol. 5187, pp. 267–275, San Diego, CA, 2003.
[4] J. H. Cheng, C. K. Liu, Y. L. Chao, and R. M. Tain, “Cooling performance of silicon-based thermoelectric device on high power LED,” International Conference on Thermoelectrics, 2005.
[5] O. Ronat, P. Green, and S. Ragona, “Accurate current control to drive high power LED strings,” Applied Power Electronics Conference and Exposition, 2006.
[6] R. F. Karlicek and Jr., “High power LED packaging,” Conference on Lasers & Electro-Optics, 2005.
[7] Lumileds Lighting, http://www.lumileds.com.
[8] 黃柏誠, ” 大面積高功率發光二極體導光元件之設計,” 碩士論文, 國立中央大學, 2004.
[9] M. R. Krames, M. Ochiai-Holcomb, G. E. Hofler, C. Carter-Coman, E. I. Chen, I. H. Tan, P. Grillot, N. F. Gardner, H. C. Chui, J. W. Huang, S. A. Stockman, F. A. Kish, and M. G. Craford, “High-power truncated-pyramid (Al0.5Ga1-x)0.5In0.5P/GaP light-emitting diodes exhibiting >50% external quantum efficiency,” Appl. Phys. Lett., vol. 75, 2365, 1999.
[10] R. H. Horng, D. S. Wuu, and S. C. Wei, “AlGaInP/AuBe/glass light-emitting diodes fabricated by wafer bonding technology,” Appl. Phys. Lett. 75, 154, 1999.
[11] C. Huh, K. S. Lee, E. J. Kang, and S. J. Park, “Improved light-output and electrical performance of InGaN-based light-emitting diode by microroughening of the p-GaN surface,” Appl. Phys. Lett., vol. 93, 9383, 2003.
[12] J. J. Wierer, D. A. Steigerwald, M. R. Krames, J. J. O’Shea, M. J. Ludowise, G. Christenson, T.-C. Shen, C. Lowery, P. S. Martin, S. Subramanya, W. Gotz, N. F. Gardner, R.S. Kern, and S. A. Stockman, “High-power AlGaInN flip-chip lighting diodes,” Appl. Phys. Lett., vol. 78, 3379, 2001.
[13] T. Komine and M. Nakagawa, “Integrated system of white LED visible-light communication and power-line communication,” IEEE Transactions on Consumer Electronics, vol. 49, no. 1, Feb. 2003.
[14] O. Atsushi, M. Yoshiteru, O. Noritaka, and D. Wang, “Unique white LED packaging systems,” Electronic Packaging Technol. Proceedings, 2003.
[15] Y. Tanaka, T. Komine, S. Haruyama, and M. Nakagawa, “Indoor visible communication utilizing plural white LEDs as lighting,” Indoor and Mobile Radio Communications, 2001.
[16] T. Taguchi, “Technological innovation of high-brightness light emitting diodes (LEDs) and a view of white LED lighting system,” OPTRONICS, vol. 19, no. 228, pp. 113-119, 2000.
[17] T. Komine and M. Nakagawa, “Fundamental analysis for Visible-Light communication system using LED lights,” IEEE Transactions on Consumer Electronics, vol. 50, no. 1, Feb. 2004.
[18] D. A. Steigerwald, J. C. Bhat, D. Collins, R. M. Fletcher, M. O. Holcomb, M. J. Ludowise, P. S. Martin, and S. L. Rudaz, “Illumination with solid state lighting technology,” IEEE J. on Selected Topics in Quantum Electronics, vol. 8, no. 2, Mar./Apr. 2002.
[19] N. Narendran and Y. Gu, “Life of LED-based white light sources,” IEEE/OSA J. Display Technol., vol. 1, no. 1, Sep. 2005.
[20] 劉如熹、林益山和康佳正, “白光發光二極體使用螢光粉專利解析,” 全華科技圖書, 2005.
[21] H. Wu, X. Zhang, C. Guo, J. Xu, M. Wu, and Q. Su, “Three-band white light from InGaN-based blue LED chip precoated with green/red phosphors,” IEEE Photon. Technol. Lett., vol. 17, no. 6, June 2005.
[22] 林志勳, “LED用單一螢光粉系統發展趨勢,” 工研院IEK化材組, Sep. 2004.
[23] 盧慶儒, “爭食白光LED市場 各式螢光粉技術陸續出籠,” Digitimes科技網, Nov. 2005.
[24] 許招墉編譯, “照明設計,” 全華科技圖書, Nov. 1999.
[25] R. S. Berns, “Billmeyer and Saltzman’s Principles of Color Technology, Third Edition,” John Wiley & Sons, 2000.
[26] 劉如熹和王健源, “白光發光二極體製作技術-21世紀人類的新曙光,” 全華科技圖書, 2001.
[27] M. Ishida, “InGaN based LEDs and their application,” OPTRONICS, vol. 19, no. 228, pp. 120-125, 2000.
[28] C. H. Chen, S. J. Chang, Y. K. Su, J. K. Sheu, J. F. Chen, C. H. Kuo, and Y. C. Lin, “Nitride-based cascade near white light-emitting diodes,” IEEE Photon. Technol. Lett., vol. 14, no. 7, July 2002.
[29] C. Huh, K. S. Lee, E. J. Kang, and S. J. Park, “Improved light-output and electrical performance of InGaN-based light-emitting diode by microroughening of the p-GaN surface,” J. Appl. Phys., vol. 93, pp. 9383–9383, 2003.
[30] S. J. Chang, L. W. Wu, Y. K. Su, Y. P. Hsu, W. C. Lai, J. M. Tsai, J. K. Sheu, and C. T. Lee, “Nitride-based LEDs with 800 C grown p-AlInGaN-GaN double-cap layers,” IEEE Photon. Technol. Lett., vol. 16, no. 6, pp. 1447–1447, Jun. 2004.
[31] T. Fujii, Y. Gao, R. Sharma, E. L. Hu, S. P. DenBaars, and S. Nakamura, “Increase in the extraction efficiency of GaN-based light-emitting diodes via surface roughening,” Appl. Phys. Lett., vol. 84, pp. 855–855, 2004.
[32] C. F. Lin, Z. J. Yang, J. H. Zheng, and J. J. Dai, “Enhanced light output in nitride-based light-emitting diodes by roughening the mesa sidewall,” IEEE Photon. Technol. Lett., vol. 17, no. 10, Oct. 2005.
[33] J. Zhang, J. Yang, G. Simin, M. Shatalov, and M. A. Khan, “Enhanced luminescence in InGaN multiple quantum wells with quaternary AlInGaN barriers,” Appl. Phys. Lett., vol. 77, pp. 2668–2671, 2000.
[34] 劉如熹和紀喨勝, “紫外光發光二極體用螢光粉介紹,” 全華科技圖書, 2003.
[35] J. Zhang, X. Hu, A. Lunev, J. Deng, Y. Bilenko, T. M. Katona, M. S. Shur, R. Gaska, and M. A. Khan, “AlGaN deep-ultraviolet light-emitting diodes,” Jpn. J. Appl. Phys., vol. 44, pp. 7250–7253, 2005.
[36] S. Kamiyama, M. Iwaya, H. Amano, and I. Akasaki, “Recent progress in nitride-based UV light emitters,” Lasers and Electro-Optics Society, 2005.
[37] J. K. Sheu, S. J. Chang, C. H. Kuo, Y. K. Su, L. W. Wu, Y. C. Lin, W. C. Lai, J. M. Tsai, G. C. Chi, and R. K. Wu, “White-light emission from near UV InGaN–GaN LED chip precoated with blue/green/red phosphors,” IEEE Photon. Technol. Lett., vol. 15, no. 1, Jan. 2003.
[38] H. X. Wang, H. D. Li, Y. B. Lee, H. Sato, K. Yamashita, T. Sugahara, and S. Sakai, “Fabrication of high-performance 370 nm ultraviolet lightemitting diodes,” J. Cryst. Growth, vol. 264, pp. 48–52, 2004.
[39] S. H. Baek, J. O. Kim, M. K. Kwon, I. K. Park, S. I. Na, J. Y. Kim, B. Kim, and S. J. Park,” Enhanced carrier confinement in AlInGaN–InGaN quantum wells in near ultraviolet light-emitting diodes,” IEEE Photon. Technol. Lett., vol. 18, no. 11, June 2006.
[40] E. F. Schubert, “Light-Emitting Diodes”, Cambridge University Press, 2003.
[41] W. J. Smith, “Modern Lens Design, Second Edition,” McGrawHill Professional, Oct 2004.